Prince O3 Hybrid Shark Oversized Prestrung Tennis Racquet Specifications: Power level: 1025 (moderate to fast) Length: 27.5 inches Headsize: 110 square inches (oversized) Cross Section: 24mm-28mm-24mm Weight: 9.8 ounces (277g), unstrung Balance: 13.2 inches (33.5cm) Grip Type: Cushion Grip O3 hybrid version of best-selling Shark--good choice for baseline and serve and volley play O-Ports have been added at the 6 and 12 o'clock points, expanding the sweet spot and increasing stability for improved performance. By replacing traditional pin-sized string holes with the giant O-Ports, a super aerodynamic frame has been created with a more responsive stringbed. This increases the sweet spot, creating a "Sweet Zone," which means you hit your best shots more often. O3 Technology provides an increased sweetspot, faster swing speed, reduced arm vibration, and increased power.